.headroom {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    transition: all .2s ease-in-out;
    z-index: 1;
}

.headroom--unpinned {
    top: -100px;
}

.headroom--pinned {
    top: 0;
}

.mybackground {
    background-image: url(../img/timg.jpg);
    background-repeat: no-repeat;
    background-size: 100% 100%;
    background-attachment: fixed;
}